WeekNumber identifies the week in the year. Valid values are 1 to 53 and -53 to -1. A negative value indicates the n'th week to the end of the year where 'n' is the absolute value of the negative value. For example, -1 specifies the last week of the year. Likewise -10 specifies the 10th to the last week of the year.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+